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  1. gradx   : horizontal gradient filter.
  2. Computes the horizontal first derivative.
  3. out-img = gradx(in-img) * (mul/1024) + add.
  4. cmnd: gradx in-img,out-img, mul  ,  add
  5. dflt: gradx    A  ,   B  , 1024  ,  128
  6. range:       <A-D>,<A-D> ,<10000>,<+/-255>
  7.